Expand partition on basic gpt disk over 2TB

With the advent of Windows Vista and Terabyte hard drives GPT disks are the future.
I'd like to ask whether Disk Director Suite or Server support their functions on GPT disks too. Especially when their size exceeds 2 TB.
The documentation from Acronis is really obscure about this.
I'd like to non-destructively expand a 2.8 TB partition on a basic 4TB GPT disk.
Is this possible under Vista or XP x64?

On a thread I started in the True Image forum section Acronis replied that as far as Disk Director is concerned, only Disk Director Server supports GPT disks but their capacity should be limited to the 2TB Limit.
So my next question is, when will disk Director Server support GPT Disks over the 2TB limit?